Preheat oven to 350F. Pour sesame seeds into a shallow bowl and set aside.
Add butter, oats and flour to a bowl and mix. Stir in salt, thyme, pecans and egg.
Roll walnut-sized pieces of dough into a ball, then roll in sesame seeds. Place on baking sheets. Use a glass dipped in water to flatten the crackers.
Bake for 15 minutes, until golden.
Serve with a selection of Irish cheeses.